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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Difference Between DBMS/RDBMS
<slowly standing - trembling, with creaks and pops as he rises> Overlays in
Turbo Pascal
One of the more challenging aspects of writing Pro*C user exit code for Forms 2.3 on a DOS client running against an Oracle 5 database was trying to link 1,000 or so C functions (at one function per file for modularity) to create a large iapx (?correct name for version?) executable within a segmented 16-bit architecture. [These young whipper-snappers today have it SO easy!]
Don Granaman
[OraSaurus]
As I recall, the Dec product was called Rdb, and generally regarded as quite good. It was subsequently bought by Oracle.
The old hierarchical and network systems did not require foreign keys, because all records were explicitly linked via hard-coded pointers. So you HAD to get your design right before building the data model, otherwise retrieval would be a nightmare.
Because relational systems allow joins at query time, a major slackness has crept into database model design. Like not always protecting the integrity of PKs...
Talking of working on small memory machines - here is a test for your age in the industry - all those who can remember writing overlays stand up! I suspect the current crop of PC software engineers have never encountered overlay programing.
peter
edinburgh
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Author: Don Granaman
INET: granaman_at_cox.net
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